Demons Pack PBR is an incredibly details character, featuring 3 Body Textures, 3 Heads & hundreds of horn options. Horns include 11 sets of two in 3 styles, and can be mixed and matched or turned off altogether. Demons are "Crouching" creatures, so most of the animations & attacks include crouching motion. The rig is available as a Humanoid as well. Almost all body parts contain emissive values, which can be controlled using the included custom shader.
https://www.infinitypbr.com/?pack=demon
https://www.assetstore.unity3d.com/#!/content/73517